[Sync] Split DirectoryChangeListener for thread-safety

chrome/browser/sync/util/logging.h

Index: chrome/browser/sync/util/logging.h
diff --git a/chrome/browser/sync/util/logging.h b/chrome/browser/sync/util/logging.h
new file mode 100644
index 0000000000000000000000000000000000000000..b28efa2cf1790799c7d0819dca64f937b8c4f5b3
--- /dev/null
+++ b/chrome/browser/sync/util/logging.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SYNC_UTIL_LOGGING_H_
+#define CHROME_BROWSER_SYNC_UTIL_LOGGING_H_
+#pragma once
+
+#include "base/logging.h"
+
+// TODO(akalin): This probably belongs in base/ somewhere.
+
+namespace tracked_objects {
+class Location;
+}  // namespace tracked_objects
+
+namespace browser_sync {
+
+bool VlogIsOnForLocation(const tracked_objects::Location& from_here,
+                         int verbose_level);
+
+}  // namespace browser_sync
+
+#define VLOG_LOC_STREAM(from_here, verbose_level)                       \
+  logging::LogMessage(from_here.file_name(), from_here.line_number(),   \
+                      -verbose_level).stream()
+
+#define VLOG_LOC(from_here, verbose_level)                              \
+  LAZY_STREAM(                                                          \
+      VLOG_LOC_STREAM(from_here, verbose_level),                        \
+      VLOG_IS_ON(verbose_level) ||                                      \
+      ::browser_sync::VlogIsOnForLocation(from_here, verbose_level))
+
+#endif  // CHROME_BROWSER_SYNC_UTIL_LOGGING_H_